Numbers 10:10 "Also in the day of your gladness and in your appointed feasts, and on the first days of your months, you shall blow the trumpets over your burnt offerings, and over the sacrifices of your peace offerings; and they shall be as a reminder of you before your God. I am the LORD your God."

Numbers 28:11 'Then at the beginning of each of your months you shall present a burnt offering to the LORD: two bulls and one ram, seven male lambs one year old without defect;

1 Chronicles 23:31 and to offer all burnt offerings to the LORD, on the sabbaths, the new moons and the fixed festivals in the number set by the ordinance concerning them, continually before the LORD. (NASB ©1995)